Kohler XTX650

Kohler XTX650The Kohler XTX650 is a 149 cc (9.1 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the XTX-series with a vertical shaft, manufactured by Kohler Co for general-purpose applications, such as log splitter, pressure washer, tiller, walk-behind mower, yard vacuum.

The cylinder bore and the piston stroke are 65.0 (2.60) and 45.0 mm (1.80 in), respectively. Compression ratio rating is 9.2:1.

The Kohler XTX650 engine produces 8.8 Nm (0.9 kg·m; 6.49 ft·lb) at 2,800 rpm of maximum torque.

The Kohler XTX650 features:

  • OHV design
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Dependable electronic magneto ignition system
  • Carburetor with fixed main jet
  • Mechanical centrifugal governor
  • Spalsh type lubrication
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine modelXTX650
Engine type4-stroke, OHV, single-cylinder
Displacement149 cm 3 (9.1 cu-in)
Max. horsepower
Max. torque8.8 Nm (0.9 kg·m; 6.49 ft·lb) at 2,800 rpm
Cooling systemForced air
Air cleanerReplaceable, paper element
Lubricating systemSplash type
Ignition systemDependable electronic magneto
Fuel systemCarburetor with fixed main jet
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity1.1 liters (1.2 US.qts, 0.97 Imp. qts)
Starting systemRecoil starter
GovernorMechanical centrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)366 x 356 x 267 mm (14.4 x 14.0 x 10.5 in)
Dry weight11.5 kg (25.3 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:9.2:1
Cylinder bore:65.0 mm (2.60 in)
Piston stroke:45.0 mm (1.80 in)
Cylinder internal diameter (standard):65.000-65.020 mm (2.5590-2.5600 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:12.990-12.996 mm (0.5114-0.5116 in)
Thrust face outer diameter (standard):64.975-64.985 mm (0.2558-0.2558 in)
Ring-to-groove side clearance (Top):0.010-0.020 mm (0.0004-0.0008 in)
Ring-to-groove side clearance (Second):0.010-0.020 mm (0.0004-0.0008 in)
Ring end gap (Top):0.100-0.250 mm (0.0039-0.0098 in)
Ring end gap (Second):0.610-0.760 mm (0.0240-0.0299 in)
Number of main bearings:2
Crankshaft main journal diameter: Flywheel: 25.005-25.019 mm (0.9844-0.9850 in)
PTO: 26.950-26.970 mm (1.0610-1.0620 in)
Crankpin journal diameter:25.985-25.995 mm (1.0230-1.0234 in)
Cylinder head
Valve arrangement:OHV, gear driven
Valves:2 (4 valves in total)
Valve head diameter (INTAKE):25.875-26.125 mm (1.0187-1.0285 in)
Valve head diameter (EXHAUST):23.875-24.125 mm (0.9399-0.9498 in)
Valve seat angle (INTAKE):44.5°
Valve seat angle (EXHAUST):44.5°
Valve seat angle (INTAKE):45°
Valve seat angle (EXHAUST):45°
Valve steam diameter (INTAKE):5.465-5.480 mm (0.2152-0.2157 in)
Valve steam diameter (EXHAUST):5.465-5.480 mm (0.2152-0.2157 in)

Tightening torque specs

Tightening torque specs
Connecting rod12.5 Nm (1.3 kgf·m; 9.2 ft·lb)
Cylinder head (torque in 2 increments) Step 1: 14.0 Nm (1.4 kgf·m; 10.3 ft·lb)
Step 2: 27.8 Nm (2.8 kgf·m; 20.5 ft·lb)
Rocker arm stud13.6 Nm (1.4 kgf·m; 10.0 ft·lb)
Rocker arm pivot jam nut9.5 Nm (1.0 kgf·m; 7.0 ft·lb)
Flywheel51.5 Nm (5.3 kgf·m; 38 ft·lb)
Muffler Exhaust stud: 5.0 Nm (0.5 kgf·m; 3.7 ft·lb)
Exhaust nut: 9.5 Nm (1.0 kgf·m; 7.0 ft·lb)
Spark plug27.0 Nm (2.75 kg·m; 20.0 ft·lb)
Oil drain plug13.6 Nm (1.4 kgf·m; 10.0 ft·lb)

Service Data

Valve clearance
Intake/Exhaust:0.0762-0.1270 mm (0.0030-0.0050 in)
Oil system
Lubrication system:Splash type
Oil type:API SJ or higher
Recommended oil:SAE 10W-30
Oil capacity:0.6 liters (0.63 US.qts, 0.53 Imp. qts)
Fuel system
Type:Carburetor with fixed main jet
Fuel filter:In-line fuel filter
Ignition system
Type:Dependable electronic magneto
Spark plug:Kohler 1413214-S
Spark plug gap:0.76 mm (0.030 in)
Ignition coil air gap0.254 mm (0.010 in)


1. Kohler XTX Series XTX650, XTX675, XTX775 service manual. Kohler Co. 2021.

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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